/*
 * Copyright 2003-2005 (c) Live Media Pty Ltd. <argot@einet.com.au> 
 *
 * This software is licensed under the Argot Public License 
 * which may be found in the file LICENSE distributed 
 * with this software.
 *
 * More information about this license can be found at
 * http://www.einet.com.au/License
 * 
 * The Developer of this software is Live Media Pty Ltd,
 * PO Box 4591, Melbourne 3001, Australia.  The license is subject 
 * to the law of Victoria, Australia, and subject to exclusive 
 * jurisdiction of the Victorian courts.
 */

using System;
using TypeElement = argot.TypeElement;
using TypeException = argot.TypeException;
using TypeInputStream = argot.TypeInputStream;
using TypeOutputStream = argot.TypeOutputStream;
using TypeReader = argot.TypeReader;
using TypeWriter = argot.TypeWriter;

namespace argot.common
{
	
	/// <summary> This represents a 8bit signed byte in big endian format.</summary>
	public class BigEndianSignedByte
	:TypeReader, TypeWriter
	{
		
		public static System.String TYPENAME = "s8";
		
		public virtual System.Object Read(TypeInputStream inStream, TypeElement element)
		{
			int i;
			
			i = inStream.Stream.ReadByte();
			
			if (i == - 1)
				throw new System.IO.EndOfStreamException();

			return (sbyte) i;
		}
		
		public virtual void  Write(TypeOutputStream outStream, System.Object o, TypeElement element)
		{
			int b;
			
			if (o is System.Int32)
			{
				b = ((System.Int32) o);
			}
			else if (o is System.Int16)
			{
				b = (int) ((System.Int16) o);
			}
			else if (o is System.Byte)
			{
				b = (int) ((System.Byte) o);
			}
			else if (o is System.SByte)
			{
				b = (int) ((System.SByte) o);
			}
			else
				throw new TypeException("S8: object not supported");
			
			// Check the range.
			if (b < MIN || b > MAX)
				throw new TypeException("U8: Out of range: " + b);
	
			outStream.Stream.WriteByte((System.Byte) b);
		}
		
		public static int MIN = - 128; //-(2^7);
		public static int MAX = 127; //2^7-1;
	}
}